Intro to Chemistry Unit Review

This model represents an element in the Periodic Table. Which element does this atomic model represent?

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NGSS.MS-PS1-1

In the Periodic Table, which of the highlighted elements has the greatest number of protons?

• Calcium, Ca

• Iron, Fe

• Aluminum, Al

• Fluorine, F

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NGSS.MS-PS1-1

Each sphere in the diagrams represents an atom. Which of the following diagrams depicts an example of a mixture?

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NGSS.MS-PS1-2

Based on the models of the compound and mixture, which is TRUE?

• A mixture has to be made up of a certain amount of each substance.

• A mixture does not have a specific make up that must be followed to be created.

• A mixture is chemically combined, so it requires a chemical reaction to be separated.

• In a mixture the substances are chemically combined, so the properties of each substance are changed.

Chase buys a helium balloon for a friend’s birthday. As he walks out of the store, it starts snowing. What do you predict will happen to the balloon, and why?

• The balloon will expand and burst because helium is less dense than cold outdoor air.

• The balloon will shrink because the cold causes the helium atoms to slow down and move closer together.

• The balloon will expand and burst because the rapid temperature change causes the helium atoms to move faster, increasing the pressure.

• The balloon will shrink because the high humidity of the air outside the store exerts a greater pressure than the dry air inside the store.

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NGSS.MS-PS1-4

Alexi is learning about the different states of matter in science class. She drew a model of gases, solids, and liquids on a poster for the bulletin board in her class. Which of the models shows the correct order for solids, liquids, and gases as the temperature and kinetic energy of the particles increases?

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

The diameter of an atom is a periodic function of its atomic number. How should sodium, aluminum, chlorine, and iodine be arranged in order of increasing number of protons in the nucleus?

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NGSS.MS-PS1-1

Kala wanted to classify common household materials as pure substances (elements or compounds) and mixtures. She collected as many things from around her house as possible and made two lists. Kala’s friend thinks that she made a mistake. What change can Kala make to her list that will correct her mistake?

• Kala should place sugar in the list of mixtures, and butter in the list of pure substances.

• Kala should place milk in the list of mixtures, and shampoo in the list of pure substances.

• Kala should place milk in the list of mixtures, and chalk in the list of pure substances.

• Kala should place baking soda in the list of mixtures, and chalk in the list of pure substances.

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NGSS.MS-PS1-1

Which atom will be the MOST reactive and why?

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NGSS.MS-PS1-2

This shows the atomic structure of a nitrogen atom. Which element will have the same valence electron structure as nitrogen?

• Aluminum (Al)

• Antimony (Sb)

• Lithium (Li)

• Oxygen (O)

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NGSS.MS-PS1-1